My uneducated opinion is that bitcoin mining doesn't always have to be profitable. If worried about decentralization, plebs can always have a small miner (water heater, for example), at home, in every home, that will decentralize mining without necessarily having to be "profitable".
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Good point about the water and home heater. I remember seeing an advertisement for "Heatbit" a home heater. I will start running this along with Apollo BTC (desktop miner/compact size) to support the network. The decentralization has to be maintained anyway possible. Thanks for sharing your thoughts :)